Cron 表达式的JavaScript验证代码

来源：互联网发布：windows xp自带壁纸编辑：程序博客网时间：2024/06/06 01:03
根据CronExpressionValidator类的思路，改写了一个Cron Expression Validator,这样在做验证就比较方便了。
    /**     * Validates a cron expression.     *     * @param cronExpression The expression to validate     * @return True is expression is valid     */    function cronValidate(cronExpression ){        //alert("校验函数的开始！");        var cronParams = cronExpression.split(" ");        if (cronParams.length < 6 || cronParams.length > 7) {            return false;        }        //CronTrigger cronTrigger = new CronTrigger();        //cronTrigger.setCronExpression( cronExpression );        if (cronParams[3] == "?" || cronParams[5]=="?") {            //Check seconds param            if (!checkSecondsField(cronParams[0])) {                return false;            }            //Check minutes param            if (!checkMinutesField(cronParams[1])) {                return false;            }            //Check hours param            if (!checkHoursField(cronParams[2])) {                return false;            }            //Check day-of-month param            if (!checkDayOfMonthField(cronParams[3])) {                return false;            }            //Check months param            if (!checkMonthsField(cronParams[4])) {                return false;            }            //Check day-of-week param            if (!checkDayOfWeekField(cronParams[5])) {                return false;            }            //Check year param            if (cronParams.length == 7) {                if (!checkYearField(cronParams[6])) {                    return false;                }            }            return true;        } else {            return false;        }    }    function checkSecondsField(secondsField) {        return checkField(secondsField, 0, 59);    }    function checkField(secondsField, minimal, maximal) {        if (secondsField.indexOf("-") > -1 ) {            var startValue = secondsField.substring(0, secondsField.indexOf( "-" ));            var endValue = secondsField.substring(secondsField.indexOf( "-" ) + 1);            if (!(checkIntValue(startValue, minimal, maximal, true) && checkIntValue(endValue, minimal, maximal, true))) {                return false;            }            try {                var startVal = parseInt(startValue, 10);                var endVal = parseInt(endValue, 10);                return endVal > startVal;            } catch (e) {                return false;            }        } else if (secondsField.indexOf(",") > -1) {            return checkListField(secondsField, minimal, maximal);        } else if (secondsField.indexOf( "/" ) > -1) {            return checkIncrementField( secondsField, minimal, maximal );        } else if (secondsField.indexOf( "*" ) != -1) {            return true;        } else {            return checkIntValue(secondsField, minimal, maximal);        }    }    function checkIntValue(value, minimal, maximal, checkExtremity) {        try {            var val = parseInt(value, 10);            //判断是否为整数            if (value == val) {                if (checkExtremity) {                    if (val < minimal || val > maximal) {                        return false;                    }                }                return true;            }            return false;        } catch (e) {            return false;        }    }    function checkMinutesField(minutesField) {        return checkField(minutesField, 0, 59);    }    function checkHoursField(hoursField) {        return checkField(hoursField, 0, 23);    }    function checkDayOfMonthField(dayOfMonthField) {        if (dayOfMonthField == "?") {            return true;        }        if (dayOfMonthField.indexOf("L") >= 0) {            return checkFieldWithLetter(dayOfMonthField, "L", 1, 7, -1, -1);        } else if ( dayOfMonthField.indexOf("W") >= 0) {            return checkFieldWithLetter(dayOfMonthField, "W", 1, 31, -1, -1);        } else if (dayOfMonthField.indexOf("C") >= 0) {            return checkFieldWithLetter(dayOfMonthField, "C", 1, 31, -1, -1);        } else {            return checkField( dayOfMonthField, 1, 31 );        }    }    function checkMonthsField(monthsField) {/*        monthsField = StringUtils.replace( monthsField, "JAN", "1" );        monthsField = StringUtils.replace( monthsField, "FEB", "2" );        monthsField = StringUtils.replace( monthsField, "MAR", "3" );        monthsField = StringUtils.replace( monthsField, "APR", "4" );        monthsField = StringUtils.replace( monthsField, "MAY", "5" );        monthsField = StringUtils.replace( monthsField, "JUN", "6" );        monthsField = StringUtils.replace( monthsField, "JUL", "7" );        monthsField = StringUtils.replace( monthsField, "AUG", "8" );        monthsField = StringUtils.replace( monthsField, "SEP", "9" );        monthsField = StringUtils.replace( monthsField, "OCT", "10" );        monthsField = StringUtils.replace( monthsField, "NOV", "11" );        monthsField = StringUtils.replace( monthsField, "DEC", "12" );*/        monthsField.replace("JAN", "1");        monthsField.replace("FEB", "2");        monthsField.replace("MAR", "3");        monthsField.replace("APR", "4");        monthsField.replace("MAY", "5");        monthsField.replace("JUN", "6");        monthsField.replace("JUL", "7");        monthsField.replace("AUG", "8");        monthsField.replace("SEP", "9");        monthsField.replace("OCT", "10");        monthsField.replace("NOV", "11");        monthsField.replace("DEC", "12");        return checkField(monthsField, 1, 31);    }    function checkDayOfWeekField(dayOfWeekField) {/*        dayOfWeekField = StringUtils.replace( dayOfWeekField, "SUN", "1" );        dayOfWeekField = StringUtils.replace( dayOfWeekField, "MON", "2" );        dayOfWeekField = StringUtils.replace( dayOfWeekField, "TUE", "3" );        dayOfWeekField = StringUtils.replace( dayOfWeekField, "WED", "4" );        dayOfWeekField = StringUtils.replace( dayOfWeekField, "THU", "5" );        dayOfWeekField = StringUtils.replace( dayOfWeekField, "FRI", "6" );        dayOfWeekField = StringUtils.replace( dayOfWeekField, "SAT", "7" );*/        dayOfWeekField.replace("SUN", "1" );        dayOfWeekField.replace("MON", "2" );        dayOfWeekField.replace("TUE", "3" );        dayOfWeekField.replace("WED", "4" );        dayOfWeekField.replace("THU", "5" );        dayOfWeekField.replace("FRI", "6" );        dayOfWeekField.replace("SAT", "7" );                if (dayOfWeekField == "?") {            return true;        }        if (dayOfWeekField.indexOf("L") >= 0) {            return checkFieldWithLetter(dayOfWeekField, "L", 1, 7, -1, -1);        } else if (dayOfWeekField.indexOf("C") >= 0) {            return checkFieldWithLetter(dayOfWeekField, "C", 1, 7, -1, -1);        } else if (dayOfWeekField.indexOf("#") >= 0) {            return checkFieldWithLetter(dayOfWeekField, "#", 1, 7, 1, 5);        } else {            return checkField(dayOfWeekField, 1, 7);        }    }    function checkYearField(yearField) {        return checkField(yearField, 1970, 2099);    }    function checkFieldWithLetter(value, letter, minimalBefore, maximalBefore,                                          minimalAfter, maximalAfter) {        var canBeAlone = false;        var canHaveIntBefore = false;        var canHaveIntAfter = false;        var mustHaveIntBefore = false;        var mustHaveIntAfter = false;        if (letter == "L") {            canBeAlone = true;            canHaveIntBefore = true;            canHaveIntAfter = false;            mustHaveIntBefore = false;            mustHaveIntAfter = false;        }        if (letter == "W" || letter == "C") {            canBeAlone = false;            canHaveIntBefore = true;            canHaveIntAfter = false;            mustHaveIntBefore = true;            mustHaveIntAfter = false;        }        if (letter == "#") {            canBeAlone = false;            canHaveIntBefore = true;            canHaveIntAfter = true;            mustHaveIntBefore = true;            mustHaveIntAfter = true;        }        var beforeLetter = "";        var afterLetter = "";        if (value.indexOf(letter) >= 0 ) {            beforeLetter = value.substring( 0, value.indexOf(letter));        }        if (!value.endsWith(letter)) {            afterLetter = value.substring( value.indexOf( letter ) + 1 );        }        if (value.indexOf(letter) >= 0) {            if (letter == value) {                return canBeAlone;            }            if (canHaveIntBefore) {                if (mustHaveIntBefore && beforeLetter.length == 0) {                    return false;                }                if (!checkIntValue(beforeLetter, minimalBefore, maximalBefore, true)){                    return false;                }            } else {                if (beforeLetter.length > 0 ) {                    return false;                }            }            if (canHaveIntAfter) {                if ( mustHaveIntAfter && afterLetter.length == 0 ) {                    return false;                }                if (!checkIntValue(afterLetter, minimalAfter, maximalAfter, true)) {                    return false;                }            } else {                if (afterLetter.length > 0) {                    return false;                }            }        }        return true;    }/*    function checkIntValue(value, minimal, maximal) {        return checkIntValue(value, minimal, maximal, true);    } */    function checkIncrementField(value, minimal, maximal) {        var start = value.substring(0, value.indexOf("/"));        var increment = value.substring(value.indexOf("/") + 1);        if (!("*" == start)) {            return checkIntValue(start, minimal, maximal, true) && checkIntValue(increment, minimal, maximal, false);        } else {            return checkIntValue(increment, minimal, maximal, true);        }    }    function checkListField(value, minimal, maximal ) {        var st = value.split(",");        var values = new Array(st.length);        for(var j = 0; j < st.length; j++) {            values[j] = st[j];        }        var previousValue = -1;        for (var i= 0; i < values.length; i++) {            var currentValue = values[i];            if (!checkIntValue(currentValue, minimal, maximal, true)) {                return false;            }            try {                var val = parseInt(currentValue, 10);                if (val <= previousValue) {                    return false;                } else {                    previousValue = val;                }            } catch (e) {                // we have always an int            }        }        return true;    }
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